Convert Kelvin to Celsius
Live bidirectional calculator for Kelvin (K) and Celsius (°C) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Subtract 273.15 from the Kelvin temperature to find the equivalent temperature on the Celsius scale.
Kelvin to Celsius Conversion Table
Precomputed values for quick reference and printing.
| Kelvin | Celsius |
|---|---|
| 1 K | -272.15 °C |
| 2 K | -271.15 °C |
| 3 K | -270.15 °C |
| 4 K | -269.15 °C |
| 5 K | -268.15 °C |
| 6 K | -267.15 °C |
| 7 K | -266.15 °C |
| 8 K | -265.15 °C |
| 9 K | -264.15 °C |
| 10 K | -263.15 °C |
| 15 K | -258.15 °C |
| 20 K | -253.15 °C |
| 25 K | -248.15 °C |
| 30 K | -243.15 °C |
| 40 K | -233.15 °C |
| 50 K | -223.15 °C |
| 75 K | -198.15 °C |
| 100 K | -173.15 °C |
| Celsius | Kelvin |
|---|---|
| 1 °C | 274.15 K |
| 2 °C | 275.15 K |
| 3 °C | 276.15 K |
| 4 °C | 277.15 K |
| 5 °C | 278.15 K |
| 6 °C | 279.15 K |
| 7 °C | 280.15 K |
| 8 °C | 281.15 K |
| 9 °C | 282.15 K |
| 10 °C | 283.15 K |
| 15 °C | 288.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 75 °C | 348.15 K |
| 100 °C | 373.15 K |
📌 Standard Benchmark Reference Values
Absolute zero (thermodynamic minimum).
Exact RatioTriple point of water.
Exact RatioAbout Kelvin (K)
The kelvin is the SI base unit of thermodynamic temperature. It is defined by setting the Boltzmann constant to exactly 1.380649 × 10⁻²³ J/K. 0 K is absolute zero.
History: Named after Lord Kelvin (William Thomson), who proposed the absolute temperature scale in 1848. Adopted as an SI base unit in 1954.
Common Uses: Physics, chemistry, engineering, color temperature in photography and lighting, and cryogenics.
About Celsius (°C)
The Celsius scale is defined so that 0 °C is the freezing point of water and 100 °C is the boiling point of water at standard atmospheric pressure.
History: Proposed by Anders Celsius in 1742 (originally inverted). The modern direction was established by Carl Linnaeus. Renamed from "centigrade" to "Celsius" in 1948 by the 9th CGPM.
Common Uses: Daily weather, cooking, scientific measurement, and industrial processes worldwide (except the US for everyday use).
❓ Frequently Asked Questions
What is 1 K in °C?
1 Kelvin (K) is equal to -272.15 Celsius (°C). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Kelvin to Celsius?
The formula is: °C = K - 273.15. Subtract 273.15 from the Kelvin temperature to find the equivalent temperature on the Celsius scale.
How do I convert 1 K to °C manually?
To convert 1 K to °C: apply the formula °C = K - 273.15. Substituting gives: 1 - 273.15 = -272.15 °C.